Impeller



FIG. 1 is a front and side perspective view of an impeller showing our new design;

FIG. 2 is a rear and opposite side perspective view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a front elevation view thereof; and,

FIG. 5 is a side elevation view thereof, all other sides are substantially mirror images of that side shown. 

The ornamental design for an impeller, as shown and described. 